What's the best way to detect whether the client is a tablet or a phone?

Question

I am currently developing a client side application which will be designed for both, smartphones and tablets. Therefore it will get two different layout modes.

While th

Answer 1

+1 for testing screen resolution rather than user agent (and iPhone vs iPad is a very simplistic test anyway—what about all those other tablet devices??)

In terms of testing for iPhone 4, i.e. retina displays, this test should work in your Javascript:

if(window.devicePixelRatio > 1){
    // Retina device...